P2006 error on 2015 Audi SQ5 TDI with 35,000km

[Lucas_R]

Hi All,

Purchased a 2nd hand 2015 model SQ5 about 6 months ago, just 3 years old and 28,000km with full service history. All has been fine up until a few days ago when the joy of seeing a check engine light ruined my day. Scanning with my Carista dongle the ECU is telling me that i have the following issue:

P2006
Intake manifold runner control stuck closed bank 1.

Upon Googling, i can see this type of error is pretty common on the single turbo 3.0T V6 TDI engine in the normal Q5/A6 etc, but have not been able to find any information relating to the bi-turbo engine used in the SQ5 (and several other Audi models such as the A6). The inlet manifold design is also different on these 2 engines.

I cleared the error code to see if it was a one-off or if it would come back again, and it came back again the following day.

So on the weekend i decided to pull off some intake bits and see what i was dealing with - to my surprise the intake pipe, throttle plate assembly and intake manifold (all located after where the EGR is plumbed into the intake) had a thick layer of soot/carbon junk on them....no wonder i was getting the error!!!

I knew this was an issue with modern diesel engines and emissions targets but wasn't aware it would be this bad with only 35,000km.

Anyway, with a combination of petrol, degreaser spray and a soft wire brush these parts are looking much cleaner and the error has not re-appeared.....yet.

I have since purchased a can of Liqui-Moly diesel intake cleaner which i will run through the engine sometime this week. I am also going to look into the possibility of an EGR delete (either physical or ECU coded delete) to stop this from happening again.



Before:








After (not perfect but much better). I also cleaned the plastic pipe leading to the inlet manifold and scrapped out the inlet manifold as best i could but didn't take pics as my hands were pretty grotty by then:

[HaydEn]

Ah! So you’re the sugar daddy I’ve been seeing getting around!

Big build up in a short time as you say, hopefully don’t have to do that every 30,000k’s.


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[Lucas_R]

Ah! So you’re the sugar daddy I’ve been seeing getting around!

Big build up in a short time as you say, hopefully don’t have to do that every 30,000k’s.

Hey mate - long time no see. Its my wife's car so she is the one driving it most of the time, although she is a bit of a rev head. I only drive it once or twice a week. In saying that, there is another SQ5 that lives about 1km away and its the same colour with the same wheels - so you might have seen that one also.

Im starting to look into these companies that specialise in "diesel carbon cleaning" to see if its actually legit (they use hydrogen and spray it into the intake while the car idles for 30-40 mins) to burn off the carbon. These services cost around $200 on average.

Prostream Diesel Fuel System Service and Intake Decarbon

Carbon Cleaning - Carbon Cleaning Australia

I am also looking at getting the ECU tuned so i would be interested if they can code out the EGR at the same time.

[HaydEn]

Haven’t actually spotted yours in particular:p Have noticed a couple getting around though so might have been!

Seems affordable, good alternative to degreaser if it’s effective.

Pop your head in the Newcastle VW centre in Lindus street Wickham. Pete is APR/VWR dealer


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[brad]

Would a ProVent catch can help that?

I don't know enough about diesels to know where all the rubbish comes from...

[Lucas_R]

Haven’t actually spotted yours in particular:p Have noticed a couple getting around though so might have been!

Seems affordable, good alternative to degreaser if it’s effective.

Pop your head in the Newcastle VW centre in Lindus street Wickham. Pete is APR/VWR dealer

Yes Pete did a service on it late last year when we first bought it. I got my wife to call past there last week and they advised where the buildup would be and said they remove, clean and replace.

Would a ProVent catch can help that?

I don't know enough about diesels to know where all the rubbish comes from...

Not sure - although i have purchased a catch can pro (bit shorter than the provent as i have limited space) and have made a mounting bracket but need to buy hoses and fittings to hook it up (no one makes a kit for this engine).

[kaanage]

Would a ProVent catch can help that?

Yep. The EGR fumes make the crankcase fumes set hard so filtering out the crankcase fumes will leave the intake much cleaner.

[Lucas_R]

Bought a Catch Can for the old girl recently. I went straight into looking at the Provent due to its popularity but its quite large (lengthwise) and i couldnt find a suitable area in the busy engine bay to be able to fit it. Ended up finding the Catch Can Pro which is also German made with similar specs to the Provent, but a little smaller in overall size and i have made a mounting bracket to secure it behind the passenger side headlight.

Catch Can Pro - Genuine Flashlube™

The RRP is around the $280-300 mark but i got it via a special order from Supercheap Auto when they had a sale recently for just over $200. Its German made, nicely designed and has the 19mm inlet and outlet same as the Provent.

There are no kits (i have Googled extensively) to suit the 3.0TDI bi-turbo which i found weird, so i have purchased some 19mm oil hose and various fittings etc to be able to mount it onto the car. Only one of the cam covers has the breather/PCV mechanism with that accordion hose feeds back into the intake just before the primary turbo - so this is where i will be tapping in and letting the catch can clean the air.

Have also arranged a stage 1 tune and EGR delete from Underground Performance, so with the catch can and the EGR delete I am hoping this will be the one and only time i need to clean out the intake manifold.

Pics below.

Catch can install for the 3.0 V6 TDI bi-turbo engine (CGQB engine code).

Who doesnt like a OEM billet compressor wheel? You can see the spot where the PCV plumbs back in just before the turbo.

Attachment 45781


1st turbo up top, 2nd turbo hiding down below.

Attachment 45782


Tapping into the factory PCV accordion hose that goes between the valve cover and the turbo inlet pipe. I used the fittings but cut the hard plastic hose off.

Attachment 45783


Catch can location (had to make a custom bracket to mount it securely).

Attachment 45784


End result. I need to get half a dozen hose clamps which i will get this weekend but for now every connection has a zip tie holding everything together.

Attachment 45785